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. This is a real-time broadcast that screams "Active Fault!" across the CAN bus. It includes a Diagnostic Trouble Code (DTC)

Standardizes how oxygen sensor or non-continuous monitor tests are reported. Key Diagnostic Messages (DMs) sae j193973 pdf exclusive

The unique 8-bit identifier for the node (e.g., Engine, Transmission) Simma Software . sae j193973 pdf exclusive

: Loggers capture DM1 messages during field tests to help OEMs troubleshoot software or hardware bugs in development. Related Products for Implementation sae j193973 pdf exclusive